I think there's an underlying issue here. I would wager that 4/5 of job postings are for internally filled positions, especially with larger enterprises with heavy HR involvement.
Let's say MegaCorp Inc. wants to promote Billy, a great Jr. developer, into a senior role for a new project. The deal is done when the manager says "Billy, I want you to be the Sr. developer for X project." The thing is that HR gets in the way and says "well, we have to make this position available publicly so that we are complying with whatever fair labor and employment laws effect us."
Those 40 companies who didn't respond probably already had a Billy lined up for the job.